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Plane Geometry
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Demonstrations 1  20 of 1083
Area of a Quadrilateral within a Triangle
New this week
Op Art with Polygon Spirals
Recursive Similar Triangles
Rhomboidal Stars
Watt's Lemniscoidal Linkage
Freese's Dissection of a Hexagram into Three Congruent Hexagrams
Freese's Dissection of a Dodecagram into a Hexagram
Construction for Three Vectors with Sum Zero
Cunningham's Simply Connected Kakeya Set
OneHalf the Apothem Times the Perimeter
Rolling a Polygon on Another Polygon
Rolling a Regular Polygon on the Unit Circle
Frederickson's Dissection of a Regular Dodecagon into Two Congruent Regular Dodecagons
Voronoi Diagrams in TwoDimensional Regions
Voronoi Diagrams for European Cities
Kakeya Needle Problem
Frederickson's Second Dissection of an Octagon to Five Octagons
Frederickson's Hinged Dissection of Five Decagons to One
Fair Sharing of an Equilateral Triangular Pizza
Lindgren's Symmetrical Decompositions of Regular 2nGons
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